Electric-arc lamp



(No Model.) 2 sheets-.sheet 1.

. R; H. MATHER.

ELECTRIC ARG LAMP. y

No. 305,617.` Patented Sept. 23, 1884.

(No Model.) 2 Sheets-Sheet 2.

R.YH. MATHER.

ELBGTRIG ARG LAMP.

No. 305,617. lPatentedsepnrza 1884.

el ix I #g5 VA l! WAM/$5555, /mw 0f:

UNITED STATES NAfrnrifr virren.

RICHARD H. MATHER, OF WINDSOR, CONNECTICUT.

ELECTRIC-ARC LAM P.

SPECIFICATION forming pari: of'Lettejrs Patent No. 3o5,61'7, dated september z3, 1884.

Application filed December 7, 1883. (No model.) I

have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification.

My invention relates to improvements in electric lamps, and particularly tothe parts thereof which relate to feeding and holding the carbon-points.

The objects of my invention are to provide fora more convenient means oi' holdingand adjusting the carbons. I attain these objects by the mechanism illustrated in theiaccompanying drawings, in which- Figure lis a side elevation of my improved lamp. Fig. 2 is a perspective view of the feed-rod andits connections. Fig. 3 is a transverse section of said feed-rod upon line :t of Fig. l. Fig. 4 is a plan view of the holder for .the lower carbon, together with the lower part of the lamp. Fig. isavertical section thereof online y y of Fig. 4; and Fig. 6 is a side elevation of a detached part of this holder. Fig. 3 is represented upon a scale twice the size of that employed in Figs. l and 2, and

. Figs. 4, 5, and 6 are represented upon a scale four times that employed for Figs.l 1 and 2.

With the exception of the lower carbon holder, the lamp may be constructed in accordance with any known or desired plan.

I have represented in Fig. 2, in connection with the feed-rod A, parts of the lamp like those shown in my Patent No. 268,254, dated November 28, 1882; but it is applicable to other lamps, and in fact I have already applied it to a lamp of 4a different construction.

The only change necessary in the feeding device and its clutch in order to adapt it for working with my rod is to change the embracingsockets therein, through which the rod passes, from the round form to the square form corresponding to the cross-section of my feedrod. This feed-rod is provided with the usual socket, c, and fastening-screw b for holding the upper carbon c. I employ spring-jaws and clamping mechanism for holding the lower carbon, B.

Upon the base C of the lamp-frame I secure an upwardly-projecting socket, d, preferably in two halves, and secured together by screws or rivets, as shown. In the upper lend of this socket I form a round hole with concave sides, and within said hole I placethe clampingjaws f, having ball-shaped projections upon their upper ends, and an interior thread at their lower ends, as shown most clearly in Fig. 5. I4 prefer to make these jaws nrst in the form of a tube, which, after shaping andthreading in substantially the form shown, is split lengthwise, and sufficient stock is removed from the inner faces ot' the clamping-jaws to allow them to come together properly.

g designates spring-jaws, which :are formed by splitting the upper end of a tube, and be low said jaws is a tapering cone, D, threaded on its exterior. Below this cone is the handle E. These jaws g, the cone D, and the handle E may all be formed in one and the same piece, or theicone and handle may be formed in one piece, and the tube for forming the jaws g may be formed of a separate piece and inserted within the handle, as shown, the handle of course being hollow for the admission of the carbon B. In order to insert the lower carbon-point, I either wholly remove thespring-jaws g and the handle E or I unscrew the cone enough to loosen the jaws. The carbon is then slipped upward in between the spring-jaws g, when, if properly constructed, they will bear upon the carbon with suflicient j friction to hold it at the desired elevation with- `and upon the spring-jaws g, press'said jaws upon the carbon, and hold it iirmly in place.

Forcing the cone thus into the jaws also has the tendency to make the ball-shaped portion of the jaws bear upon the concave wallsV of the socket with sufticient force to hold the p jaws in whatever position they may be set. The concave walls in the upper. end of the socket d are of sufficient breadth to hold the jaws in place by their ball-shaped ends, and

IOO

at the same time allow them to rook or tip therein in the Well-known manner of a bal1- andsocket joint or other form of universal joint. This enables the jaws to be rocked or tipped so as to bring the lower carbon directly underneath the upper carbon. By the employment of this clamping mechanism for the lower carbon it can be inserted from below the base of the lamp, while the handle also extends below the lamp and may be operated from that point, whereby the holder is operated much more conveniently than it could be in case it was necessary to reach above the base of the lamp-frame to fasten the carbon in place.

It will also be seen that it is necessary to manipulate a single mechanism only in order to simultaneously fasten in position the carbon-holding jaws and the members of the uni` versal joint. y

While I prefer to employ the spring-jaws g for receiving the carbon, it is evident that the jawsf may be made to impinge directly upon the carbon instead of the jaws g, which construction would utilize a portion of the advantages of my invention and would be a great improvement upon the old set-screw and socket for electric lamps. Y

I am aware. that a priorv patent shows an electric lamp in which a friction-clutch feed having an embracing socket is combined with a feed-rod which is square in cross-section,

and that other patents show :blower-carbon holder having jaws which are forced together by a screw sleeve or nut, also lamps in which the lower-carbon holder is mounted on a unversal joint. All of said prior art is hereby disclaimed.

I claim as my invention-- 1. The combination of the frame of an electric lamp, a carbon-holder having jaws for clamping the carbon, a universal joint which connects the carbon-holder with the lampframe, and a single mechanism consisting of the handle having cone D for simultaneous Y,

`ly fastening in position the jaws and joint,

substantially as described, and for the purpose specied. v

2; The combination oi' the tapering-cone D,

.threaded on itsvexterior,` the handle E, the yjaws f, having ball-shaped projections upon their upper ends, and a socket in which said jaws are mounted, substantially as described, and for the purpose specified.

3. The combination of the spring-jaws g, cone D, the jaws f, acting upon said springjaws, and the socket within which said jawsf are mounted, substantially as described, and for the purpose specified.

RICHARD H. MATHER. Witnesses: l HIRAM WILLEY, CHAsA. SAFFORD. 

